7. Note that the roots for characteristic equation of u" - 4u = 0 are 2, -2. Given the initial conditions u(0) = 5 and u'(0) = 4, (a). Find the solution to the IVP using the exponential form of the general solution: u(t) = C₁e²t + C₂e-2t (b). Find the solution to the same IVP using the hyperbolic form of the general solution: u(t) = C₁ cosh 2t + C₂ sinh 2t

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